Electric heating apparatus



- A 1,63?747 June 28,1927. A C. E' JOHNSON y Y ELECTRIC HEATING APBARATUS Filed July 50. 1925 2 Sheets-Sheet 1 attua aq 1,633,747 June 28'1927' v c. JOHNSON ELECTRIC HEATING APPARATUS Filed July 50. 1925 2 sheets-sheet 2 cnewuwv..

atroz um* Patented June Z8, 1927.

CARL E. JOHNSON, or DETRI'i, MicniGAN.

ELECTRIC HEATING APPARATUS.

Ap-piieuo ined July ao, 1925. serial No. 47,109.

This invention relates to improvements in heating'apparatus and has for its prime object to' provide av heater particularly adapted for heating Water in bath tubs and the like.

further object of the invention is the provisionof an electric heater having inte-l rior and exterior heating surfaces to facilitate the heating of Water and `the like.

still` `further object of the invention is they provisionA of an electric heaterof the above ycharacter WhichH is extremely simple and durable ofconstruction and designed so as to quickly heat the Water or other liquid matter in which it is immersed.

Other objects and advantages of this invention will become apparent as thedes'crip tion injogresses. l i

In the aeconrpanying drawings forming a part of this speciiicationand in Whichlile numerals are employed to designate corresponding parts throughout the saine:

Figure 1 is a side elevational view of a heating apparatus eonstructedin accordance with my invention, ,c y

Figure 2 is a horizontal sectional" view taken on the line 2 2 ofFi'gure 1,

Figure' is a central vertical sectional View through the apparaitus,r

Figure fl is a fragmentary perspective view olf one of the detail elements, andl Figure 5 is a similar View of aporton o'l the apparatus. f y

In the drawings, wherein for the purpose ofk illustration is shown the preferred em! bodiment of my invention', the innneral 10' generally designatesthe outer casing ofiny improved apparatus, embodying a cylindrical body provided with a conical cover member upon the upper end of which' is formed a sleeve 11. The levier 'extremity oi' this outer casingk 10 is open so .as t0 engagean inner'coacti'ngr casing 12. This inner casing is of cylindrical formation enclosed at the upper end by` a cireular cover plate 13, and

arranged in spaced relation Within the outer casing. Formed o'n the lower end of the in ner casing 12 is an outwardly directed an-4 nulai flange plate 14 etending'outvvardly so as to Contact with thelloWer edge `ofthe outer casing and securely astenedthereto by means of an upturned flange 15. This construction provides al pair of spaced casings arranged one Within another so ais to provide a. substantial compartment between the up per enclosederlds of the casings and an annular chamber between the side Walls of these casing members'.

Securely mounted in the annular chamber formed betvveen the Walls of the inner and outer containers, are a plurality of vertically positioned support bars 16 preferably constructed of hard rubber or Aother insulating materi'aland arranged at spaced intervals in the chamber. Formed on the upper extremi-l ties of these support bars are upvvardlydt rected lugs 16 apertured to engage suitable brating apparatus. Each of the bars leis provided \`vitn` a plurality of transverse openings 17 arranged in vertical alignment so asto readily receive a heating element. The loiver extremities of thesup'port bars 16 are secured position by vertically ext'c'rlding ears 18 'struck out from the annu-V lar ange plate 14 and bent tdan angie or' 'O so as tojcontact with thelewer side of` the bars. `The bars' are secured to1 the ears 18 by rivets or in any suitable manner soI as to prevent' displacement thereof. The up# per ends o'f the support bars 16 are held securely in position by nfieans of a supportv frame 19' comprising a plurality of radially directed arms o'ifset adjacent their outer eX- tremities and connected tothe members 16 by holts oirivets.' The ycentral portion of the" lframe 19 carries a; connection" box 2O car# rying a ypair olf oppositelydis'posed' terminal screws' V21 so as to receive the terminals' of the electric heating element.

Anjrur- @ontlading arbe 2e extends; epm the upper p'orti'on oi the inner Ycasing 12 to the closure member ofthe outer casing 10,A this tube being ksecured to the casing cover so as to permit the escape of air from the inner casing when the heater is immersed in a. liquid. 1 w

A pair of electric current eo'n'ducting Wires 23 are inserted' through the sleeve 11 and secured to the terminal' box' 20 by means of the terminal screws 21. An electric. heating coil 24 also connects' with tlie terminal box 20 and is arranged in a substantially spiral' manner in'tl'i'e'casing chamber, thisv coiled resistance Wire being inserted through rthe openings 17 formed in theinsul'ati'ng bars 15. 4@ne of thev insulatingrr bars 16V is provided onuits outer longitudinal edgevwith a groove -V25',` as clearly sh'own' in Figure 4,' one end of the resistance Wire 24 extending thr'oi'igh this groove to conrp'l'etethe connection, this end of the Wire being secured to CII the opposite terminal screw. This arrangement permits even distribution of the heating element and avoids the possibility of short circuiting the coil, due to the provision of the insulating support bars through which the coil is extended.

The apparatus is supported upon a suitable stand embodying a bottom plate composed of an annular tlange plate 2T coinplementary with the flange plate la and secured thereto, this plate 27 being adapted to tightly enclose the lower portion of the structure. The central portion of the bottom plate 26 comprises tour radially extending arms 2S, thus forming a light and durable bottom plate. The peripheral edges ot the bottom plate are provided with angular projections Q9 preferably tour in number, to which are secured angular supporting legs 30, the upper portions of these legs extending somewhat above the bottom plate 26 and supporting a guard ring 31.

lt is apparent, from the foregoing description and drawings, thatan electric heater ot compact and durable construction is provided embodying at the same time utmost simplicity in design so that the device may be saleable at a comparatively low cost. The device is particularly adaptable 'for heating the water in bath tubs obviating the necessity ot tiring a boiler and at the same time permitting more ellicient control of the temperature. The particular construction ot the apparatus provides an unusually large heating surface thereby facilitating the use of the device and thus obtaining the greatest el:- ticiency from the heating element.

It is to be understood that the form of my invention herewith shown and described is to be taken as the preferred example ot' the same and that various changes as to the size, shape and arrangement of part-s may be resorted to without departing from the spirit ot' the invention, or the scope of the subjoined claims.

Having thus described my invention, I claim:

l. A device of the class described including, in combinatioin'a cylindrical outer casing, a cylindrical inner casing, a plurality ot support bars interposed between the inner and outer casings, a supporting stand formed on the lower end of the casings, a brace frame connected to the upper extremities of the support bars, and a heating element arranged spirally between the inner and outer casings and extending through suitable apertures termed on the said bars.

2, An electric heater comprising, in combination, an outer cylindrical casing having a conical cover member, an inner cylindrical casing enclosed at the upper end and provided with an annular flange at the lower end, the said flange connecting with the outer casing, a support stand secured to the said annular flange, a plurality of vertically cxtendingsupport bars mounted between the inner and outer casing members, a bracing traine mounted in the upper portion ot the outer casing` connecting with the upper extremities ot the support bars, and an air conducting pipe secured to the inner and outer chambers and adapted to exhaust the air from the inner chamber; and a heating element secured to the brace frame extending spirally within the outer casing through apertures formed in the support bars.

3. An electric heater comprising, in combination, an outer casing provided with a sleeve on the upper end thereof, an inner casing arranged in spaced relation with the outer casing, an annular llange formed on the inner casing and connecting with the outer casing, a support stand secured to the lower ends of the casings, an exhaust pipe secured to the said casings, a support frame mounted in the outer casing comprising a plurality of radially directed arms secured to the upper ends of the support bars, the lower extremities of the support bars being secured by ears struck from the inner casing flange, and a heating element secured to the support t `ame extending-through suitable apertures iormed in the support bars.

a. In a device of the kind described, a cylindrical inner casing, a cylindrical outer casing concentric with the inner casing and provided with a closed top having a centrally disposed neck, said inner casing likewise having a closed top and being provided with a flange at its bottom to close the space between the inner and outer casings, a series of spaced vertical bars arranged between the inner and outer casings and bearing against said casings, said bars being each provided with a row ol' vertically spaced openings and each having an ear at its upper end, one ot' said bars having a longitudinal groove in the edge adjacent the inner casing, trame bars extending radially inward trom said ears and inclined upwardly therefrom, a connection box supported by the inner ends ot' the frame bars, a pair ot spaced terminal screws carried by said box, lead wires extending trom said screws through said neclr, a resistance element extending around the casings through the openings in the vertical bars and having one end connected to one ot' the terminal screws, the remaining end ot said element extending upwardly through the groove in the traine bar and connected to the other terminal screw, and a tube extending from the top ot the inner casing and opening through the top otl the outer casing.

In testimony whereof I allix my signature.

CARL E. JOHNSON. 

